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,\ d (Model.) l pf I. H. BABCOGK.

Goveringfor Steam Pipes, 8m.`

N0. 240,497. Patented April 26., 188|.

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UNITED STATES ISAAC H. BABCOGK, OF LQGKPQRT, NEW YORK.

/GOVERING FOR STEAMFPIPES, Sac.

SPECIFICATION formingpart of Letters Patent No. 240,497, dated April 26, 1881. Application tiled October 21, 1880. (Model.)

To all whom it 'may concern:

Be it knownV that I, ISAAC H. BABoocK, a

` citizen of the United States, residing at Lockport, in the county of Niagara and State of New York, have invented certain new and useful Improvements in Wooden Coverings for either Steam or Hot-Air Metal Pipes; and I do hereby declare that the followingis a full, clear, and exact description thereof, reference being had to the accompanying drawings and letters of reference marked thereon, forming a part of this specification of my invention,

.and in which drawings likelettersindicate like parts in the several gures.

My invention relates to an improved wooden covering for either steam or hotair metal pipes, to prevent radiation of heat therefrom, and thereby prevent condensation and loss in said pipes.

My `invention consists, in the main, in inclosing either a steam or hot-air metal pipe in a wood casing having two chambers of confined air surrounding said metal pipe, said casing or covering being constructed out of one solid log or block of wood, substantially as shown in the accompanying drawings; and also in protecting the inner surface of the wooden casing or covering, by tin or other suitable sheet metal,from injury, in consequence ofthe radiation of heat from the inclosed steam or hotair pipe 5 and also in providing a smooth bed for the steam or hot-air pipe to impinge upon Aeither directly ori upon suitable bearings or saddles placed under said pipe, and in either case to reduce.. friction between said met-al or iron pipe and the wooden casing during the expansion and contraction of the steam or hotair pipe, and so prevent injury to the wooden casing by friction.

In the drawings, Figure l isa longitudinal section of my improved steam or hot-air"pipe covering, with a steam or hot air pipe inserted centrally thereof. Fig. 2 is a crosssection of the same in the line .am of Fig. l. Fig. 3 is a perspective view of the sleeve or tenon by which sections of my improved wooden casing or covering for steam or hot-air pipes are united one to another.

In Figs. 1 and 2A indicates a section or one length 'of the wooden casing, constructed of one piece of wood, either round or square,nw

externally, (round preferred,) bored out cen-` trally and longitudinally, the bore being sufficiently large throughout the same to receive and incase4 a steam or hot-air pipe, B, and leave an airfchamber, c, around the pipe B, and also receive a tin or other proper tubular metallic lining, f, as represented in said iigures.

a and a2 are annular air-chambers, formed by boring with a proper tool in toeach end of the log or block or casin g A asuitablel distance, according to the lengthof the same, leaving a solidportion or partition, g, of greater orless volume between said air-chambers, andwithout destroying the continuity of the one piecef of timber of which the section or one length of the wooden coveringis composed, and thereby forming the confined air-chambers a and o2 when the sleeves or tenons D are placed in position for uniting two lengths of the wooden covering, A and A', as shown in Fig. l.

D, Fig. 3, is a -sleeve or tenon, of annular form, as shown, properly constructed to unite two' sections, A and A', of the wooden covering, a-nd also to ,close the air-chambers a. a2 hermetically when inserted in position, as shown in Fig. 1; and c is an annular mortise or shouldered recess, to hold the tenons D in position, as shown in Fig. 1, and may be made either in the outer shell, r, or the inner shell, rf, of the wooden covering A, which inclose said air-chambers a a2, as shown.

As represented in Figs. l and 2, a tubular piece of tin or other smooth sheet metal, as at f, is fitted closely to the inner surt'aceof the` wooden casing or covering A, in order to reduce the friction between the steam or hot-air pipe B and the'wooden coveringA, as well as prevent said covering from charring andreceiving other injury from exposureto the heat of the inclosed steam or hot-air pipe B.

a is an air-chamber between the steam or hot air pipe B and the wood casin g or covering A, which will constitute a coniined airchamber by tamping asbestus, mineral-wool, or any nonconclucting and indestructible substance around the pipe B in the chamber a, at Y or near each end of a section of my improved wooden covering, or at any other point along IOO 3o escape of heat through the joint made at the f the inclosed pipe B, as may be desired, thus making the air-chamber et ot' greater or less length at will.

Heretofore wooden coverings for steam and hot-air pipes have been constructed of more or less pieces ot` wood or plank joined together by continin g nails or screws, and having more or less joints liable to be sprung open by the action of the heat from the inclosed steam or hot-air pipe;`but by my improved covering such objection is avoided, while at the same time I produce a covering which is more "4 mechanical7 and cheaper in construction, as well as more durable.

As an exterior finish for my improved covering for steam and hot-air pipes, I apply an outer coating of suitable pitch, and while the same is still warm I apply thereon a coating vof sawdust, which, embedding itselt' into the pitch, t'orms with it an outward coating, which preserves the wooden covering from decay, and also preventsit from checkin g 7 or crackimg n In practice I prefer to have the metallic tubular lining f extend from one length or section ofthe wooden coveringinto an adjoinin glen gth or section, as indicated in Fig. l, and thereby break joints7 at the point of junction of such lengths of said covering. I thus prevent the junction of such lengths or sections.

In place of the solid portion g, an annular sleeve or ring could be substituted and serve the same purpose 5 but I prefer to have the partition g solid, as above described.

Having thus described my invention, what I claim as new, and desire to secure by Iletters Patent, is-

l. A non-conducting covering for steam and hot air-pipes, having an air chamber or chambers isolated from the central passage, through which the pipe B passes, and with its body portion constructed of a single piece of wood, substantially as described.

2. A non-conducting coveringfor steam and hot-air pipes constructed ot' a single piece of Wood with air-chambers a a2, having a solid portion or partition, g, intervening between said spaces, substantially as described.

3. The combination otl the inner metallic lining,f, steam or hot-air pipe B, intervening chamber, u, wooden covering A A', provided with chambers a' ai", and sleeve or tenon D, substantially as described.

4. rIhe combination of the inner metallic lining, f, steam or hot-air pipe B, wooden covering A A', and sleeve or tenon D, substantially as and for the purpose described.

Signed in presence of two subscribing witnesses.

ISAAC H. BABGOGK.

Witnesses:

D. F. BrsHoP, WM. D. HALL. 

